The Mitsubishi MD003 is a solid-state RF switch capable of switching
up to 5 watts in the frequency range 800 - 940 MHz.
Looking at the module, with the label facing you, pin 1 is on the left
hand side.
Connections are as follows :
1 2 3 4 5 6 7
GND RX GND BIAS ANT GND TX
With NO current into the BIAS pin (4) the ANT is connected to RX with a
loss of 1 - 1.5 dB.
When you supply a current of 50 mA into the bias pin (through a series
resistor) the ANT is connected to TX with a loss of 0.5 - 0.7 dB.
With a 100 mA bias, it can handle 12 watts max.
T-R isolation is 30 - 35 dB.